Bag closure



G. K. ODEN BAG CLOSURE Jan. 16, 1951 Filed Feb. 26, 1948 Patented Jan. 16, 1951 UNITED STATES BAG CLOSURE Giista K. Odn, Nybro, Sweden Application February 26, 1948, Serial No. 11,001 g f In Sweden-December 7, 1945 This invention relates toenvelopes or bags made from paper and similar material, and more. particularly to the closing of such bags.

It is among the objects of. this invention to.

provide a bag which can be closed easily and 5 v 6 over onto the lower part of. the folded-down.

securely without auxiliary fastening elements, which can be opened readily without destroying the closure, and which is easy and inexpensive to manufacture. v

In accordance with this invention the open end of the bag is provided with certainfolds and slits so that the open end can be folded shut and its folded portions interlocked in such a way that the bag will remain closed and will prevent, even granular material from escaping therefrom."

The preferredembodiment of the invention is illustrated in the accompanying drawings in which Fig. 1 is a side view of the unfolded. bag,

with the folds indicated by broken lines; Fig. 2

is a similar view but with the open end of the bag folded down over the rest of it; and Fig. 3 is a view showing the bag completely closed.

Referring to Fig. 1 of the drawings, a flat rectangular envelope or bag, preferably made ,of fairly stiff paper, is open only along its top edge I. The bag is provided with a fold 3 extending from the upper left hand corner diagonally across the upper portion of the bag to the opposite side 4. This forms a triangular portion bounded by edges l and 4 and fold 3. The angle abetween this fold and the upper edge of the bag is less than the angle 1) between the fold and the side edge 2 of the bag, and therefore is less than 45. The reason for this is that it is desirable, as will appear presently, that the upper edge l of the bag should be spaced from side edge 2 when the triangular portion above fold 3 is folded down over the rest of the bag as shown in Fig. 2, Suitable spacing of edges 1 and 2 is obtained when angle a is about 35, although few degrees more or less will not make any particular difference.

The bag is provided with a second fold 6 that extends from fold 3 diagonally across the bag to edge 2. To make the bag appear symmetrical when it is closed, the upper end of fold 6 preferably intersects fold 3 midway between the ends of the latter, while the lower end of fold 6 intersects edge 2 the same distance from the top of the bag as the lower end of fold 3. Extending from the upper end of fold 6 to upper edge I of the bag is a'third fold 5 which faces in the opposite direction from the other two folds, but which is So positioned that when the triangular upper portion ofthe bag is folded down to the e? bn' "Shown in Fig.2, foldS will. overlie am] sill-aims. (01. 229-552) 6 These overlying folds form thebase of apointed portion havingconverging sides formed by' edge 3 and fold 3.. As shown in Fig. 3, th'is pointed portion of the bag is bent on folds 5 and triangular portion of the bag. V This triangular portions lower part,.WIl ch is bounded byupper edge 1, side edge 4, and folds 3 and 5, has a slit! entirely through it. in a position to permit. the tip of. the pointedportion of.

the bag to be inserted in it as shownin Fig. The bag preferably has a slit 8 extending inward from edge 2 about midway. between fold 6 and;

the upper end of thebag in the space between i edges I and 2.. By making this slit substantially parallel to fold 3 a tongue}! (Fig. 3) is formed. having parallel sides. for a short distance, The tongue extends through slit 1 whilejslit ii receiyesf Pe h. .g ihe low parrot h ar a;wm ir ing slit l and helps toin'terlock the 'interengaged folded portions of the bag.

It will be seen that this bag is easy to manufacture because it is of conventional shape and is merely provided with three folds and two slits. The upper end of the bag can readily be folded and interlocked to hold the bag closed, and can be opened just as easily and then reclosed if desired. The outward pressure of the contents of the bag on the side walls of the bag can not This bag is particularly suitable for granular material because the sharp folds and the absence of slits in the body of the bag will keep the material from leaking out of it.

According to the provisions of the patent statutes, I have explained the principle of my invention and have illustrated and described what I now consider to represent its best embodiment. However, I desire to have it understood that, within the scope of the appended claims, the invention may be practiced otherwise than as specifically illustrated and described.

m I claim:

l. A bag of paper or the like having an open upper end and a first fold extending from one upper corner diagonally across the upper portion 7 of the bag at an angle with its upper edge of less than 45 to form above the fold a triangular having a second fold extending from the central triangular: portion, the: bagbeing -provided with:

a short slit extending inward from said side edge above the second fold, and said lower part of said;

4 upper end and a first fold extending from one upper corner diagonally across the upper portion of the bag at an angle with its upper edge of less than 45 to form above the fold a triangular portion adapted to be folded down over the rest of the bag with said upper edge spaced inward from the adjacent side edge of the bag, the bag having, avsecond fold extending from the center of the'firstZ-fold diagonally acrossthe. bag to intriangular portion being provided with a slit' substantially parallel to its lower edge and adapt ed to receive said folded pointed portion from itsr tip to the inner end of said short slit. y

2. A bag of paper or the like-liavihg an open upper end and a first fold extending frornone up= per corner diagonally across the upper 'portionazof the bag at an angle with its upper edge. of less than. 45? tolform above-theiold a triangular portIorLadapt'edito be folded down over:'the rest of thebagwithisaidfuppen edge sp aoe'diinwardifrom the; adjacent. sideedge. of'tlie'bag; thdiag hav a; second fold;- mctending from; the central; port-ion of the first-"fold diagonally" across( the bag to said side ed'ge, tli bag; navm astmra'rm extending fromthelin'nei: end. ofthe secondroia np.-, to said' upper edgein a; position to overlie the. second'lfoldlwhen saidltriang'ulan portion is'iold' ed;- down, portionlofthe bag above. said. over-- lyingipfblds beinglpoihtedl and radapted toi be fold? ed; down oven. the lower part ofi saidi foldeditriangular; portion. the" bag being provided 9 with 'a SHOI'CLSIifi extending inward from said side edgealimienthelsecondlfold; said slitbeing substantially. parallel mine first-fold to for-ma tongue. betweenlthemeandsaid lower. partof i said trianportion being provided with alslit ad'apted. tdreceive saidtonguea V .l3llAibagwof paper-oi: the likehaving: anop'en:

t'rsct said'side edge at aboutthe same level as the lower end of the first fold, the bag having a third fold extending from the inner end of the second fold up to said upper edge in a position to overlie thesecond fold when said triangular portion is folded down, the portion of the bag above said overlying" folds-"being pointed and adapted to be folded down over the lower part of said folded triangular portion, the bag being provided witl'i'a short slit extending inward from said side edge. aboutlnidway betweenthe second fold and thfe top 'of thefba'g, said slitfbei'ng substantially paranertq thefi" ti id toiorn atonguejbetween them, and said loi ver'partpfsaid"triangular: Diortion'being providedwith aslitsubstantially parallel' lower edge andiadapted to receive said tongue 1 easements.

REFERENCES CITED Thee followinggrreferences are: of. record: in the file of this? patent:

f IUNITE D STATES PA'IEN'I-S Number rea ism Burris r Sept. 22, 1925 e FGREl'GNPATENTS Number. r a Country Date Gernaany- .l.. Aug 9;, 1913 

